Specifically, the snap behavior (we already know that the pgs went inconsistent while the pool was in writeback mode, right?). -Sam On Thu, Aug 20, 2015 at 4:22 PM, Samuel Just <sjust@xxxxxxxxxx> wrote: > Yeah, I'm trying to confirm that the issues did happen in writeback mode. > -Sam > > On Thu, Aug 20, 2015 at 4:21 PM, Voloshanenko Igor > <igor.voloshanenko@xxxxxxxxx> wrote: >> Right. But issues started... >> >> 2015-08-21 2:20 GMT+03:00 Samuel Just <sjust@xxxxxxxxxx>: >>> >>> But that was still in writeback mode, right? >>> -Sam >>> >>> On Thu, Aug 20, 2015 at 4:18 PM, Voloshanenko Igor >>> <igor.voloshanenko@xxxxxxxxx> wrote: >>> > WE haven't set values for max_bytes / max_objects.. and all data >>> > initially >>> > writes only to cache layer and not flushed at all to cold layer. >>> > >>> > Then we received notification from monitoring that we collect about >>> > 750GB in >>> > hot pool ) So i changed values for max_object_bytes to be 0,9 of disk >>> > size... And then evicting/flushing started... >>> > >>> > And issue with snapshots arrived >>> > >>> > 2015-08-21 2:15 GMT+03:00 Samuel Just <sjust@xxxxxxxxxx>: >>> >> >>> >> Not sure what you mean by: >>> >> >>> >> but it's stop to work in same moment, when cache layer fulfilled with >>> >> data and evict/flush started... >>> >> -Sam >>> >> >>> >> On Thu, Aug 20, 2015 at 4:11 PM, Voloshanenko Igor >>> >> <igor.voloshanenko@xxxxxxxxx> wrote: >>> >> > No, when we start draining cache - bad pgs was in place... >>> >> > We have big rebalance (disk by disk - to change journal side on both >>> >> > hot/cold layers).. All was Ok, but after 2 days - arrived scrub >>> >> > errors >>> >> > and 2 >>> >> > pgs inconsistent... >>> >> > >>> >> > In writeback - yes, looks like snapshot works good. but it's stop to >>> >> > work in >>> >> > same moment, when cache layer fulfilled with data and evict/flush >>> >> > started... >>> >> > >>> >> > >>> >> > >>> >> > 2015-08-21 2:09 GMT+03:00 Samuel Just <sjust@xxxxxxxxxx>: >>> >> >> >>> >> >> So you started draining the cache pool before you saw either the >>> >> >> inconsistent pgs or the anomalous snap behavior? (That is, >>> >> >> writeback >>> >> >> mode was working correctly?) >>> >> >> -Sam >>> >> >> >>> >> >> On Thu, Aug 20, 2015 at 4:07 PM, Voloshanenko Igor >>> >> >> <igor.voloshanenko@xxxxxxxxx> wrote: >>> >> >> > Good joke ))))))))) >>> >> >> > >>> >> >> > 2015-08-21 2:06 GMT+03:00 Samuel Just <sjust@xxxxxxxxxx>: >>> >> >> >> >>> >> >> >> Certainly, don't reproduce this with a cluster you care about :). >>> >> >> >> -Sam >>> >> >> >> >>> >> >> >> On Thu, Aug 20, 2015 at 4:02 PM, Samuel Just <sjust@xxxxxxxxxx> >>> >> >> >> wrote: >>> >> >> >> > What's supposed to happen is that the client transparently >>> >> >> >> > directs >>> >> >> >> > all >>> >> >> >> > requests to the cache pool rather than the cold pool when there >>> >> >> >> > is >>> >> >> >> > a >>> >> >> >> > cache pool. If the kernel is sending requests to the cold >>> >> >> >> > pool, >>> >> >> >> > that's probably where the bug is. Odd. It could also be a bug >>> >> >> >> > specific 'forward' mode either in the client or on the osd. >>> >> >> >> > Why >>> >> >> >> > did >>> >> >> >> > you have it in that mode? >>> >> >> >> > -Sam >>> >> >> >> > >>> >> >> >> > On Thu, Aug 20, 2015 at 3:58 PM, Voloshanenko Igor >>> >> >> >> > <igor.voloshanenko@xxxxxxxxx> wrote: >>> >> >> >> >> We used 4.x branch, as we have "very good" Samsung 850 pro in >>> >> >> >> >> production, >>> >> >> >> >> and they don;t support ncq_trim... >>> >> >> >> >> >>> >> >> >> >> And 4,x first branch which include exceptions for this in >>> >> >> >> >> libsata.c. >>> >> >> >> >> >>> >> >> >> >> sure we can backport this 1 line to 3.x branch, but we prefer >>> >> >> >> >> no >>> >> >> >> >> to >>> >> >> >> >> go >>> >> >> >> >> deeper if packege for new kernel exist. >>> >> >> >> >> >>> >> >> >> >> 2015-08-21 1:56 GMT+03:00 Voloshanenko Igor >>> >> >> >> >> <igor.voloshanenko@xxxxxxxxx>: >>> >> >> >> >>> >>> >> >> >> >>> root@test:~# uname -a >>> >> >> >> >>> Linux ix-s5 4.0.4-040004-generic #201505171336 SMP Sun May 17 >>> >> >> >> >>> 17:37:22 >>> >> >> >> >>> UTC >>> >> >> >> >>> 2015 x86_64 x86_64 x86_64 GNU/Linux >>> >> >> >> >>> >>> >> >> >> >>> 2015-08-21 1:54 GMT+03:00 Samuel Just <sjust@xxxxxxxxxx>: >>> >> >> >> >>>> >>> >> >> >> >>>> Also, can you include the kernel version? >>> >> >> >> >>>> -Sam >>> >> >> >> >>>> >>> >> >> >> >>>> On Thu, Aug 20, 2015 at 3:51 PM, Samuel Just >>> >> >> >> >>>> <sjust@xxxxxxxxxx> >>> >> >> >> >>>> wrote: >>> >> >> >> >>>> > Snapshotting with cache/tiering *is* supposed to work. >>> >> >> >> >>>> > Can >>> >> >> >> >>>> > you >>> >> >> >> >>>> > open a >>> >> >> >> >>>> > bug? >>> >> >> >> >>>> > -Sam >>> >> >> >> >>>> > >>> >> >> >> >>>> > On Thu, Aug 20, 2015 at 3:36 PM, Andrija Panic >>> >> >> >> >>>> > <andrija.panic@xxxxxxxxx> wrote: >>> >> >> >> >>>> >> This was related to the caching layer, which doesnt >>> >> >> >> >>>> >> support >>> >> >> >> >>>> >> snapshooting per >>> >> >> >> >>>> >> docs...for sake of closing the thread. >>> >> >> >> >>>> >> >>> >> >> >> >>>> >> On 17 August 2015 at 21:15, Voloshanenko Igor >>> >> >> >> >>>> >> <igor.voloshanenko@xxxxxxxxx> >>> >> >> >> >>>> >> wrote: >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> Hi all, can you please help me with unexplained >>> >> >> >> >>>> >>> situation... >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> All snapshot inside ceph broken... >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> So, as example, we have VM template, as rbd inside ceph. >>> >> >> >> >>>> >>> We can map it and mount to check that all ok with it >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> root@test:~# rbd map >>> >> >> >> >>>> >>> cold-storage/0e23c701-401d-4465-b9b4-c02939d57bb5 >>> >> >> >> >>>> >>> /dev/rbd0 >>> >> >> >> >>>> >>> root@test:~# parted /dev/rbd0 print >>> >> >> >> >>>> >>> Model: Unknown (unknown) >>> >> >> >> >>>> >>> Disk /dev/rbd0: 10.7GB >>> >> >> >> >>>> >>> Sector size (logical/physical): 512B/512B >>> >> >> >> >>>> >>> Partition Table: msdos >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> Number Start End Size Type File system >>> >> >> >> >>>> >>> Flags >>> >> >> >> >>>> >>> 1 1049kB 525MB 524MB primary ext4 >>> >> >> >> >>>> >>> boot >>> >> >> >> >>>> >>> 2 525MB 10.7GB 10.2GB primary >>> >> >> >> >>>> >>> lvm >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> Than i want to create snap, so i do: >>> >> >> >> >>>> >>> root@test:~# rbd snap create >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> cold-storage/0e23c701-401d-4465-b9b4-c02939d57bb5@new_snap >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> And now i want to map it: >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> root@test:~# rbd map >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> cold-storage/0e23c701-401d-4465-b9b4-c02939d57bb5@new_snap >>> >> >> >> >>>> >>> /dev/rbd1 >>> >> >> >> >>>> >>> root@test:~# parted /dev/rbd1 print >>> >> >> >> >>>> >>> Warning: Unable to open /dev/rbd1 read-write (Read-only >>> >> >> >> >>>> >>> file >>> >> >> >> >>>> >>> system). >>> >> >> >> >>>> >>> /dev/rbd1 has been opened read-only. >>> >> >> >> >>>> >>> Warning: Unable to open /dev/rbd1 read-write (Read-only >>> >> >> >> >>>> >>> file >>> >> >> >> >>>> >>> system). >>> >> >> >> >>>> >>> /dev/rbd1 has been opened read-only. >>> >> >> >> >>>> >>> Error: /dev/rbd1: unrecognised disk label >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> Even md5 different... >>> >> >> >> >>>> >>> root@ix-s2:~# md5sum /dev/rbd0 >>> >> >> >> >>>> >>> 9a47797a07fee3a3d71316e22891d752 /dev/rbd0 >>> >> >> >> >>>> >>> root@ix-s2:~# md5sum /dev/rbd1 >>> >> >> >> >>>> >>> e450f50b9ffa0073fae940ee858a43ce /dev/rbd1 >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> Ok, now i protect snap and create clone... but same >>> >> >> >> >>>> >>> thing... >>> >> >> >> >>>> >>> md5 for clone same as for snap,, >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> root@test:~# rbd unmap /dev/rbd1 >>> >> >> >> >>>> >>> root@test:~# rbd snap protect >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> cold-storage/0e23c701-401d-4465-b9b4-c02939d57bb5@new_snap >>> >> >> >> >>>> >>> root@test:~# rbd clone >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> cold-storage/0e23c701-401d-4465-b9b4-c02939d57bb5@new_snap >>> >> >> >> >>>> >>> cold-storage/test-image >>> >> >> >> >>>> >>> root@test:~# rbd map cold-storage/test-image >>> >> >> >> >>>> >>> /dev/rbd1 >>> >> >> >> >>>> >>> root@test:~# md5sum /dev/rbd1 >>> >> >> >> >>>> >>> e450f50b9ffa0073fae940ee858a43ce /dev/rbd1 >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> .... but it's broken... >>> >> >> >> >>>> >>> root@test:~# parted /dev/rbd1 print >>> >> >> >> >>>> >>> Error: /dev/rbd1: unrecognised disk label >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> ========= >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> tech details: >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> root@test:~# ceph -v >>> >> >> >> >>>> >>> ceph version 0.94.2 >>> >> >> >> >>>> >>> (5fb85614ca8f354284c713a2f9c610860720bbf3) >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> We have 2 inconstistent pgs, but all images not placed >>> >> >> >> >>>> >>> on >>> >> >> >> >>>> >>> this >>> >> >> >> >>>> >>> pgs... >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> root@test:~# ceph health detail >>> >> >> >> >>>> >>> HEALTH_ERR 2 pgs inconsistent; 18 scrub errors >>> >> >> >> >>>> >>> pg 2.490 is active+clean+inconsistent, acting [56,15,29] >>> >> >> >> >>>> >>> pg 2.c4 is active+clean+inconsistent, acting [56,10,42] >>> >> >> >> >>>> >>> 18 scrub errors >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> ============ >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> root@test:~# ceph osd map cold-storage >>> >> >> >> >>>> >>> 0e23c701-401d-4465-b9b4-c02939d57bb5 >>> >> >> >> >>>> >>> osdmap e16770 pool 'cold-storage' (2) object >>> >> >> >> >>>> >>> '0e23c701-401d-4465-b9b4-c02939d57bb5' -> pg 2.74458f70 >>> >> >> >> >>>> >>> (2.770) >>> >> >> >> >>>> >>> -> up >>> >> >> >> >>>> >>> ([37,15,14], p37) acting ([37,15,14], p37) >>> >> >> >> >>>> >>> root@test:~# ceph osd map cold-storage >>> >> >> >> >>>> >>> 0e23c701-401d-4465-b9b4-c02939d57bb5@snap >>> >> >> >> >>>> >>> osdmap e16770 pool 'cold-storage' (2) object >>> >> >> >> >>>> >>> '0e23c701-401d-4465-b9b4-c02939d57bb5@snap' -> pg >>> >> >> >> >>>> >>> 2.793cd4a3 >>> >> >> >> >>>> >>> (2.4a3) >>> >> >> >> >>>> >>> -> up >>> >> >> >> >>>> >>> ([12,23,17], p12) acting ([12,23,17], p12) >>> >> >> >> >>>> >>> root@test:~# ceph osd map cold-storage >>> >> >> >> >>>> >>> 0e23c701-401d-4465-b9b4-c02939d57bb5@test-image >>> >> >> >> >>>> >>> osdmap e16770 pool 'cold-storage' (2) object >>> >> >> >> >>>> >>> '0e23c701-401d-4465-b9b4-c02939d57bb5@test-image' -> pg >>> >> >> >> >>>> >>> 2.9519c2a9 >>> >> >> >> >>>> >>> (2.2a9) >>> >> >> >> >>>> >>> -> up ([12,44,23], p12) acting ([12,44,23], p12) >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> Also we use cache layer, which in current moment - in >>> >> >> >> >>>> >>> forward >>> >> >> >> >>>> >>> mode... >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> Can you please help me with this.. As my brain stop to >>> >> >> >> >>>> >>> understand >>> >> >> >> >>>> >>> what is >>> >> >> >> >>>> >>> going on... >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> Thank in advance! >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >>> _______________________________________________ >>> >> >> >> >>>> >>> ceph-users mailing list >>> >> >> >> >>>> >>> ceph-users@xxxxxxxxxxxxxx >>> >> >> >> >>>> >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>> >> >> >> >>>> >>> >>> >> >> >> >>>> >> >>> >> >> >> >>>> >> >>> >> >> >> >>>> >> >>> >> >> >> >>>> >> -- >>> >> >> >> >>>> >> >>> >> >> >> >>>> >> Andrija Panić >>> >> >> >> >>>> >> >>> >> >> >> >>>> >> _______________________________________________ >>> >> >> >> >>>> >> ceph-users mailing list >>> >> >> >> >>>> >> ceph-users@xxxxxxxxxxxxxx >>> >> >> >> >>>> >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>> >> >> >> >>>> >> >>> >> >> >> >>> >>> >> >> >> >>> >>> >> >> >> >> >>> >> >> > >>> >> >> > >>> >> > >>> >> > >>> > >>> > >> >> _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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